<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
	</head>
	<body>
		<script>
			let num = 100;
			function test(num){// 形参 ： 形式参数
				console.log(num);
			}
			test(1);
		</script>
	</body>
</html>
